Transmission-line device



Nov. 6, 192s. 1,690,184

R. M. STUMM TRANSMISSION LINE DEVICE Filed OCT.. 20, 1927 INVENTOR Foss M 570mm.

Patented Nov. 6, 1928.

' UNITED STATES PATENT NoFl'flicze.

ROSS M. STUMM, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO''WlS'III\l'GIIOI'J'SIJ ELECTRIC SUMANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

TRANSMISSION-LINE Dnvicn.

.Application filed` October 20, 1927. Serial No. 227,451.`

My invention relates to transmission-line devices andy particularly to electrostatic-eldcontrol structures for high-voltage suspeir sion insulators. y

One object of Iny .invention is to provide adevice of the above-indicated characterthat shall be protected against damage by movelment of the line conductor under certain con- Another object of myinvention is to provide 2a substantially annular electrostaticfield-control structure that may be mounted anddemounted relative to its position about an insulator, while the latter is in operative position betweenthe line conductor and a Vmain support. x

A furtherfobject of my invention is to 4provide a transmission-line devicethat shall be simple and durable in construction, economi- `cal to manufacture and effective in its operation.

In transmission-line practice, it has been usual to provide electrostatic-ield-control structures, such as arcin-grings and shields, about the insulator aXis adjacent to the ends of the insulator.

By reason of the lateral extent of these members, when the conductor breaks or when violent vline oscillations occur, the concluetor sometimes engages the perimeter of the ring or shield with suilicient force'to permanently distort the latter and lrender it unlit for further effective service.

Also, where annular field-controlrings or- `shields are constructed of oneintegral piece yor are assembled as one integral structure for mounting, as such, relative the insulator,

' Athe latter has vbeen required to lbe detached either from its Amain support or-tower, or from theconductor, in order that the fieldcontrol device may be placed therearound.

It `is my yaim tofovercome the above-mentioned objections and to providey a transmis sion-line `field-control device that vhas other advantages. v y

Accordingly, in practicing my invention, I lprovide an `electrostatic-fieldscontrol element of substantially annular shape, in general, that is provided with spaces above the con- :ductor whereby rthe latter -may pass into the spaces, iunder certain conditions, without injuring'the device whichis further constructed tccompensate the field for the spaces `thus the insulator axis while the insulator is in operative position. y

Figure 1 of the accompanying drawing is a side elevationalview of a structure `en 'bodying my' invention,

Fig. 2 is a plan view of the 'structure'shown in Fig. 1, parts beingp'broken away and omitted, and V Fig. 3 is a view, similar to Fig. Zand `on a reduced scale, of a modified form of my finv'ention. 'Y

Referring to Figs. 1 and 2,the device comprises, in general, asuspension 'clampQ for supporting a conductor 3. an insulator 4 and a field-c'ontrol'device 5 of 'my invention.

yprovided and to permit its installation-about Y of N. A. Wahlberg, Serial No. 209,@9, filed July 30, 1927, andA assigned to the Westing- V Ahouse Electric and Manufacti'iringCompany,

and comprises a lower channel member 7 constituting one clamping portion, an upper clamping shoe 8, a leaf spring' 9 for resiliently biasingthe shoe 8 against the conductor 3 in 'the channel -i'nember 7 ,by means o'f a cam and alug structure (not shown)i,`between"the arms of a yoke member 10. The latter is fpiv- A Yotally attached fto. the channel lmember 7by means of trunnions 12 that are secured in jpo sitl'on opposite the conductor 3 by rlinks 14 .and a bolt 15.v

The detailed construction and. operation of the clamp 2 are not particularly germane to this invention,y as claimed, vit lbein-g 'sui-ieient to note, for the purpose herein disclosed, that the above-mentioned slipping Vaction takes `place when the yoke 10 and the channel member V7 `are angularly ino'ved 'a certain amount about the axis ofthe trunnions 12.

.As viewed in Fig. 1, it can be seen'that, were the device 5 completely annular in shape, any considerable angular change between 'the conductor 3 and the vertical axis of ythe insulator 4 would -be likely to cause the conductor 3 to en agethe structure.

In accordance wit l this intention, howl:

over, the device 5 comprises a field-control element 17 thatris of substantially annular shape, in general, but has spaces 18 opposite the conductor 3, into which the latter may move under the above-mentioned conditions.

To compensate the field for the portions of the device which are omitted to provide the spaces 18, the oppositelv disposed half portions of the element 17 may be provided with spherical or otherwise constituted end portions 20.

Supporting elements 22 of substantially U-sha-pe may be secured, at their closed inner ends, to bosses 23 on the yoke V10, as by bolts 24, and, at ythe outer' ends thereof, to lugs 25 on thc element 17, as by bolts 26.

Under normal operating conditions, the element 17 functions substantially as an ordinary arcing ring, but when, for any cause, the conductor 3 moves toward the element 17 a sufficient distance, the conductor passes through the spaces 18 and returns therethrough to normal position, when normal conditions are restored, without having damaged the field-control device 5.

Further, since the field-control device 5 is constructed in separately mountable and demountable half portions, it may readily be mounted in operative position, without detaching the insulator 4 from either end.

In the modilication of my invention illusu trated in Fig. 3, in which corresponding parts are designated by corresponding reference characters, the structure is substantially the same as that described above, except that, instead of the tubular or rodlike half elements 17, that are connected by the supporting elements 22, a one-piece shield 28 of relatively thin sheet metal is substituted therefor. f

The half portions of the shield 28 may be joined as .in the alcove-describedI structure, but, as shown, they are integrally united by a web portion 29 at one side of the yoke 10. A similar web or supporting element 3() may be removably connected between the halves at the opposite side of the yoke 10, as by bolts 81, to permit the shield to be placed around the axis of the insulator while the latter is in operative position, or the element may constitute an integral part of the shield, as desired.

The shield 28 may be secured to the bosses on Athegyoke 10 by L-members 32 each having a vertical arm 33 secured to the bosses, as by the screws 24 shown in Figs. 1 and 2, and a horizontal arm 34 on which the shield rests and is secured thereto, as by screws 35.

By my invention, an extremely simple and economical structure is provided that permits of ready mounting and is effective in operation, has the other advantages abovementioned, and is, in general, an improvement in the service for which it is intended.

While I have shown and described particu- Y lar forms of my invention, changes may be effected therein without departing from the spirit and scope thereof as set forth in the appended claims.

I claim as my invention:

1. In a transmission-line device, the combination with an insulator, of an electrostatic field control structure comprising spaced portions at opposite sides of the line conductor between which the conductor may freely pass.

2. In a transmission-line device, the conibination with an insulator, of an electrostatic-field-control structure extending laterally relative to the insulator axis and havin spaced perimetral portions between whic the line conductor may freely pass.

3. In a transmission-line device, the combination with an insulator, of an electrostatic-held control structure of substantially annular shape, in general, extending laterally to the insulator axis but having an opening in the perimeter thereof through which the line conductor may pass.

4. In a transmission-line device, the combination with an insulator, of an electrostati c-iield-control structure comprising separately mountable and demountable spaced portions at. opposite sides of the line conductor between which the conductor may pass.

5. In a transmission-line device, the combination with anrinsulator, of an electrostaticfield-control structure comprising spaced portions at opposite sides of the line conductor between which the conductor may pass only under predetermined line conditions.

6. In a transmission-line device, the combination with an insulator and a clamp for normally holding the line conductor and permitting the same to slip relative thereto, of an clectrostatic-field-control structure comprising spaced portions at opposite sides of the conductor between which the conductor may pass under conditions which cause the conductor to slip.

7. In a transmission-line device, the combination with an insulator, of an electrostaticheld-control structure comprising spaced portions at opposite sides of the line conductor between which the conductor may pass an d means for compensating the field for thc space between said portions.

8. In a transmission-line device, the combination with an insulator, of an electrostaticheld-control structure oi substantially annular shape, in general, extending laterally to the insulator axis but having a space in the perimeter thereof in which the line conductor may be received, said structure being shaped adjacent to said space to compensate the field therefor.

9. In a transmission-line device, the combination with an insulator, of an electrostaticheld-control structure of substantially annular shape, in general, disposed about the tor may be received and being constructed for mounting and demounting relative to the insulator While the latter is inoperative posi- Vtion between the conductor and a main suport. p10. A transmission-line device comprising a substantially annular electrostatic-fieldeontrol element having diametrically opposite perimetral spaces permitting the line con ductor to move freely across the perimeter When the element and the conductor move angularly relative to each other a certain 15 distance.

11. A transmission-line device comprising a substantially annular electrostatiofieldcontrol element constructed of half portions providing diametrically-opposite spaces between the halves extending inwardly from the perimeter ofthe annular element.

12. A transmission-line device comprising a substantially annular electrostatic-fieldcontrol element including half annular por- I tions having spaced adjacent ends and an intermediate mounting portion.

In testimony whereof, I have hereunto subscribed my naine this 30th day or Sept.7 1927.

Ross M. sTUMM. 

